Switch from Node.js crypto to Web Crypto

[flevi29]

Pull Request

What does this PR do?

• It switches from Node.js crypto to Web Crypto, this way nullifying all problems related to node and browser compatibility issues we previously had
  • Use of SubtleCrypto: importKey()
  • Use of SubtleCrypto: sign()
  • Use of btoa
  • Use of TextEncoder
• As all of this is compatible with at least EOL Node.js 16 and quite old browsers, this is not a breaking change of any kind